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Retroperitoneal space and Retroperitoneal organs

The retroperitoneal space (retroperitoneum) is the anatomical space (sometimes a potential space) in the abdominal cavity behind (retro) the peritoneum. Description from imgarcade.com. I searched for this on bing.com/images

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Psoas muscle abscess and fluid collections are located in the retrofascial space rather than in the retroperitoneal space because the psoas muscles are located posterior to the transversalis fascia, which is the posterior boundary of the retroperitoneum. Ultrasonography is diagnostic in only 60% of cases of psoas abscess, compared with 80% to 100% for CT. Read more: http://radiopaedia.org/articles/psoas-muscle-abscess

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Pneumoretroperitoneum is by definition presence of gas within the retroperitoneal space. It is always abnormal and has a relatively small differential. http://radiopaedia.org/articles/pneumoretroperitoneum

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The retroperitoneum is the part of the abdominal cavity that lies between the posterior parietal peritoneum and anterior to the transversalis fascia. It is divided into three spaces by the perirenal fascia and is best visualised using CT or MRI. The three spaces are: anterior pararenal space perirenal space posterior pararenal space http://radiopaedia.org/articles/retroperitoneum

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Drawing of the anatomy of the retroperitoneal spaces at the level of the kidneys. The anterior pararenal space (APRS) is located between the parietal peritoneum (PP) and the anterior renal fascia (ARF) and contains the pancreas (Pan), the ascending colon (AC), and the descending colon (DC). The posterior pararenal space (PPRS) is located between the posterior renal fascia (PRF) and the transversalis fascia (TF). The perirenal space (PRS) is located between the anterior renal fascia and the…

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Figure 2 Identification and incision of the white line of Toldt and mobilization of the colon and access to the retroperitoneal space (arrow).

Radiology Essentials 105 : Sectional Anatomy of Retroperitoneal Spaces

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